PL700 Rebuild

[Overundr1]

Verified the buss bar was grounded to chassis. Added the star ground just to be sure with no noted change.

 

[George S.]

B+ and B- rail voltages are good?
If so, than see what Joe thinks.

 

[Overundr1]

B+ 109.9vdc

B- -109.7 vdc

On mains

 

[Overundr1]

Wondering if I need to install the other two rca pre drivers since this is an original 700 back plane, late tonight will try that tomorrow.

 

[Sunnbobb]

Signal from source is clean?

 

[Overundr1]

Verified clean scope trace yes

 

[mlucitt]

I would put my ungrounded scope on the outputs to see the distortion, then work backwards along the signal path until I found no distortion. If this issue is present on both channels, it is likely a power problem. Ensure the rail fuses are all good by verifying the voltage on the load side of each rail fuse.
Good luck hunting.

 

[Overundr1]

Will get back to this, family health issues.